Improvement in hot-blast ovens or furnaces



l f7/jim @Mi mig i@ www? dnitrd gime @anni @wird Lenen Patent No. 101,449, dated An-u 5, 1870.

IMPROVEMENT IN HOT-BLAST OVENS ORF'URNACES.

The Schedule referred to in these Letters Patent and making partbf the same.

To all lwhom it 'may conce/ru:

Be it known that I, EDMUND M. FERGUsoN,'of Bradys Bend, in the county of Armstrong, and State of Pennsylvania, have invented a new and useful 11n-- provement in Hot-blast Ovens; and I do herebydeclare the following to be a full, clear, and exact description thereof.

My invention consists in an improved construction and arrangement of stoves for hot blast, whereby not onlyis thefacility of removing or replacing any of the pipes increased, but the heated air is so directed and distributed throughout the oven in its relation to Nthe introduction of. the airwhen cold, and its dischargev when properly heated, as to secure a moreI equable aud uniform temperature of all the pipes, and so as to lessen the liability of one being more readily injured than another by excessive heat.

To enable others skilled in the art to construct and use my invention, I willA proceed to describe' it, with reference to the accompanying drawings forming part of this specilication, lin whichv Figure 1 is a side elevation of theupper portion of is the rest of the apparatus `which I am about to describe) of cast-iron.plaeed horizontally, one on each side of the stove, in the heating-chamber above the chamber in which the gas to heat the Astove is introduced and burned, which is called the gasehamb`er.

At the front end of on'e'of these main trunks a, the air enters cold, and passes out at the rear endof the other trunk a', heated to the, required degree for the h ot blast.

The gas-chamber is arched' or covered over with brick-work, the roof of the gas-chan1ber forming the floor of the heating-chamber.

Immediatelyabove the longitudinal trunks a a' is placed a number of transverse pipes `b b, the ends of which rest ou the tops of the trunks a a', but the weight of the pipes being sustained by thev brick# work of the licor of the heating-chamber, there is no weight upon the trunks a a. l

Between each of the transverse .pipes b and its adjacent pipe b is an opening in the floor, so as to allow the llame and heat to pass up from the gas-chamber through these` apertures into the heated chamber above.

Ou each of the transverse horizontal pipes b bis.

a number of short necks or collars, c, each surround# ing an opening into the pipe, and, on each of these necks c is set a vertical standing pipe, d d.

Each of these standing pipes is cylindrical and straight, and has a partition, e, extending through its axis from its lower end to a point a little less than the diameter of the standing pipe from its upper extremity.

In the transverse horizontal pipes b b are alsopartitions i extending from the top of each of. the short necks c to the bottom of the pipe, and lling its entire cross-section, so as to prevent the passage of air directly through the horizontal pipes b b.

The standing pipes al are set on the necks c in such a manner that when in place the lower end of the partition c in the standing pipe coincides with and touches the upper end o'f the partition t in the horizontal pipes b b, so as to forni a continuous partition or barrier against the passage of the air through the horizontal pipes b b, and compel it, in passing on toward the exit trunk a', to rise up one side of the standing pipes and down on the other side.

As the partitions i in the transverse pipes b b are placed across them, it is necessary that the standing pipes should be so. set as to place the partition c in these standing pipes similarly, so that the partitions may coincide, and thus it happens, also, that the side of the standing pipes along which runs the edge of the partition e is turned toward the opening in the door through which the heat and flame pass, and, as that side is ,the strongest, being supported inwardly by the partition, it is less likelyto become warped or misshapenby the heat.

As there are nolpartitions' or obstacles inthe horizontal trunks c a', the air passes through them freely, traversing the inlet trunk (aand passing. up into any and all of the horizontal transverse pipes b b, with equal facility, and thence traversing the standing pipes (l d, reaches the outlet-trunk a', thoroughly heated.

As the same air does not pass through more than one series of standing pipes, but as some of the air' admitted into the'inlet-trunk a passes through each ofthe series of standing pipes d,- the air traverses the pipes more slowly, with less friction, and the apparatus is more uniformly heated, than if the air passed successively,through each and every one of the, vertical pipes.

In case any one of the vertical pipes should become warped or otherwise need to be replaced, it can'be done with but very little inconvenience, as each standing pipe (l is independent of all the others, and stands v vertically on its own base. When it is removed a cap, f, which has no partition in it, and which will he high enough to allow the air to pass over the partiwith their edgesv turned toward the passages through which the heated gas entersl the heating-chamber, so

as to expose the 'strongest part of the pipe to the greatest heat.

3. The use of the removable caps f, in connection with the ycollarsc on the transverse pipes b b, when the Vertical standing pipes are removed, for the purpose described. v

In testimony whereof, I, the said EDMU'ND M. FER- GUSON, have hereunto set my hand.

. E. M. FERGUSON.

Witnesses :l

R. 0. WRENSHALL, THos. It. KERK. 

